Kenta Cho shmup free on iTunes

The game is free, importantly, but you will have to buy an iPod Touch or an iPhone to play - it's those hidden charges again.

rRootage involves continually shooting at a mother ship while avoiding baddies. Simple. You control the ship with your finger, and activate special powers by tapping the touch-screen with another digit.

Kenta Cho is the boss behind Japanese freeware creator ABA Games. His projects are usually bonkers reinterpretations of retro favourites.